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358 lines
10 KiB
JavaScript
358 lines
10 KiB
JavaScript
/*!
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* jQuery Smooth Scroll - v2.2.0 - 2017-05-05
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* https://github.com/kswedberg/jquery-smooth-scroll
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* Copyright (c) 2017 Karl Swedberg
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* Licensed MIT
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*/
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(function(factory) {
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if (typeof define === 'function' && define.amd) {
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// AMD. Register as an anonymous module.
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define(['jquery'], factory);
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} else if (typeof module === 'object' && module.exports) {
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// CommonJS
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factory(require('jquery'));
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} else {
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// Browser globals
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factory(jQuery);
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}
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}(function($) {
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var version = '2.2.0';
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var optionOverrides = {};
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var defaults = {
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exclude: [],
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excludeWithin: [],
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offset: 0,
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// one of 'top' or 'left'
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direction: 'top',
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// if set, bind click events through delegation
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// supported since jQuery 1.4.2
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delegateSelector: null,
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// jQuery set of elements you wish to scroll (for $.smoothScroll).
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// if null (default), $('html, body').firstScrollable() is used.
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scrollElement: null,
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// only use if you want to override default behavior
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scrollTarget: null,
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// automatically focus the target element after scrolling to it
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autoFocus: false,
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// fn(opts) function to be called before scrolling occurs.
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// `this` is the element(s) being scrolled
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beforeScroll: function() {},
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// fn(opts) function to be called after scrolling occurs.
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// `this` is the triggering element
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afterScroll: function() {},
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// easing name. jQuery comes with "swing" and "linear." For others, you'll need an easing plugin
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// from jQuery UI or elsewhere
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easing: 'swing',
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// speed can be a number or 'auto'
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// if 'auto', the speed will be calculated based on the formula:
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// (current scroll position - target scroll position) / autoCoeffic
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speed: 400,
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// coefficient for "auto" speed
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autoCoefficient: 2,
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// $.fn.smoothScroll only: whether to prevent the default click action
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preventDefault: true
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};
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var getScrollable = function(opts) {
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var scrollable = [];
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var scrolled = false;
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var dir = opts.dir && opts.dir === 'left' ? 'scrollLeft' : 'scrollTop';
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this.each(function() {
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var el = $(this);
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if (this === document || this === window) {
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return;
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}
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if (document.scrollingElement && (this === document.documentElement || this === document.body)) {
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scrollable.push(document.scrollingElement);
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return false;
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}
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if (el[dir]() > 0) {
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scrollable.push(this);
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} else {
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// if scroll(Top|Left) === 0, nudge the element 1px and see if it moves
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el[dir](1);
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scrolled = el[dir]() > 0;
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if (scrolled) {
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scrollable.push(this);
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}
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// then put it back, of course
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el[dir](0);
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}
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});
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if (!scrollable.length) {
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this.each(function() {
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// If no scrollable elements and <html> has scroll-behavior:smooth because
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// "When this property is specified on the root element, it applies to the viewport instead."
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// and "The scroll-behavior property of the … body element is *not* propagated to the viewport."
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// → https://drafts.csswg.org/cssom-view/#propdef-scroll-behavior
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if (this === document.documentElement && $(this).css('scrollBehavior') === 'smooth') {
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scrollable = [this];
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}
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// If still no scrollable elements, fall back to <body>,
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// if it's in the jQuery collection
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// (doing this because Safari sets scrollTop async,
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// so can't set it to 1 and immediately get the value.)
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if (!scrollable.length && this.nodeName === 'BODY') {
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scrollable = [this];
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}
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});
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}
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// Use the first scrollable element if we're calling firstScrollable()
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if (opts.el === 'first' && scrollable.length > 1) {
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scrollable = [scrollable[0]];
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}
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return scrollable;
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};
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var rRelative = /^([\-\+]=)(\d+)/;
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$.fn.extend({
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scrollable: function(dir) {
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var scrl = getScrollable.call(this, {dir: dir});
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return this.pushStack(scrl);
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},
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firstScrollable: function(dir) {
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var scrl = getScrollable.call(this, {el: 'first', dir: dir});
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return this.pushStack(scrl);
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},
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smoothScroll: function(options, extra) {
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options = options || {};
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if (options === 'options') {
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if (!extra) {
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return this.first().data('ssOpts');
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}
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return this.each(function() {
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var $this = $(this);
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var opts = $.extend($this.data('ssOpts') || {}, extra);
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$(this).data('ssOpts', opts);
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});
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}
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var opts = $.extend({}, $.fn.smoothScroll.defaults, options);
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var clickHandler = function(event) {
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var escapeSelector = function(str) {
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return str.replace(/(:|\.|\/)/g, '\\$1');
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};
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var link = this;
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var $link = $(this);
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var thisOpts = $.extend({}, opts, $link.data('ssOpts') || {});
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var exclude = opts.exclude;
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var excludeWithin = thisOpts.excludeWithin;
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var elCounter = 0;
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var ewlCounter = 0;
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var include = true;
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var clickOpts = {};
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var locationPath = $.smoothScroll.filterPath(location.pathname);
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var linkPath = $.smoothScroll.filterPath(link.pathname);
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var hostMatch = location.hostname === link.hostname || !link.hostname;
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var pathMatch = thisOpts.scrollTarget || (linkPath === locationPath);
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var thisHash = escapeSelector(link.hash);
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if (thisHash && !$(thisHash).length) {
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include = false;
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}
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if (!thisOpts.scrollTarget && (!hostMatch || !pathMatch || !thisHash)) {
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include = false;
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} else {
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while (include && elCounter < exclude.length) {
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if ($link.is(escapeSelector(exclude[elCounter++]))) {
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include = false;
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}
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}
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while (include && ewlCounter < excludeWithin.length) {
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if ($link.closest(excludeWithin[ewlCounter++]).length) {
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include = false;
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}
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}
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}
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if (include) {
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if (thisOpts.preventDefault) {
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event.preventDefault();
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}
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$.extend(clickOpts, thisOpts, {
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scrollTarget: thisOpts.scrollTarget || thisHash,
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link: link
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});
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$.smoothScroll(clickOpts);
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}
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};
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if (options.delegateSelector !== null) {
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this
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.off('click.smoothscroll', options.delegateSelector)
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.on('click.smoothscroll', options.delegateSelector, clickHandler);
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} else {
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this
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.off('click.smoothscroll')
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.on('click.smoothscroll', clickHandler);
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}
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return this;
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}
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});
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var getExplicitOffset = function(val) {
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var explicit = {relative: ''};
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var parts = typeof val === 'string' && rRelative.exec(val);
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if (typeof val === 'number') {
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explicit.px = val;
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} else if (parts) {
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explicit.relative = parts[1];
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explicit.px = parseFloat(parts[2]) || 0;
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}
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return explicit;
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};
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var onAfterScroll = function(opts) {
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var $tgt = $(opts.scrollTarget);
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if (opts.autoFocus && $tgt.length) {
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$tgt[0].focus();
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if (!$tgt.is(document.activeElement)) {
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$tgt.prop({tabIndex: -1});
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$tgt[0].focus();
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}
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}
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opts.afterScroll.call(opts.link, opts);
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};
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$.smoothScroll = function(options, px) {
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if (options === 'options' && typeof px === 'object') {
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return $.extend(optionOverrides, px);
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}
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var opts, $scroller, speed, delta;
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var explicitOffset = getExplicitOffset(options);
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var scrollTargetOffset = {};
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var scrollerOffset = 0;
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var offPos = 'offset';
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var scrollDir = 'scrollTop';
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var aniProps = {};
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var aniOpts = {};
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if (explicitOffset.px) {
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opts = $.extend({link: null}, $.fn.smoothScroll.defaults, optionOverrides);
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} else {
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opts = $.extend({link: null}, $.fn.smoothScroll.defaults, options || {}, optionOverrides);
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if (opts.scrollElement) {
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offPos = 'position';
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if (opts.scrollElement.css('position') === 'static') {
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opts.scrollElement.css('position', 'relative');
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}
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}
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if (px) {
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explicitOffset = getExplicitOffset(px);
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}
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}
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scrollDir = opts.direction === 'left' ? 'scrollLeft' : scrollDir;
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if (opts.scrollElement) {
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$scroller = opts.scrollElement;
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if (!explicitOffset.px && !(/^(?:HTML|BODY)$/).test($scroller[0].nodeName)) {
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scrollerOffset = $scroller[scrollDir]();
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}
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} else {
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$scroller = $('html, body').firstScrollable(opts.direction);
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}
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// beforeScroll callback function must fire before calculating offset
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opts.beforeScroll.call($scroller, opts);
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scrollTargetOffset = explicitOffset.px ? explicitOffset : {
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relative: '',
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px: ($(opts.scrollTarget)[offPos]() && $(opts.scrollTarget)[offPos]()[opts.direction]) || 0
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};
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aniProps[scrollDir] = scrollTargetOffset.relative + (scrollTargetOffset.px + scrollerOffset + opts.offset);
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speed = opts.speed;
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// automatically calculate the speed of the scroll based on distance / coefficient
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if (speed === 'auto') {
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// $scroller[scrollDir]() is position before scroll, aniProps[scrollDir] is position after
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// When delta is greater, speed will be greater.
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delta = Math.abs(aniProps[scrollDir] - $scroller[scrollDir]());
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// Divide the delta by the coefficient
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speed = delta / opts.autoCoefficient;
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}
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aniOpts = {
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duration: speed,
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easing: opts.easing,
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complete: function() {
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onAfterScroll(opts);
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}
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};
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if (opts.step) {
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aniOpts.step = opts.step;
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}
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if ($scroller.length) {
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$scroller.stop().animate(aniProps, aniOpts);
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} else {
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onAfterScroll(opts);
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}
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};
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$.smoothScroll.version = version;
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$.smoothScroll.filterPath = function(string) {
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string = string || '';
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return string
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.replace(/^\//, '')
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.replace(/(?:index|default).[a-zA-Z]{3,4}$/, '')
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.replace(/\/$/, '');
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};
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// default options
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$.fn.smoothScroll.defaults = defaults;
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}));
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